# Circuit question

#### ftwpmg

Joined Nov 12, 2019
1
Been sitting on a couple of questions and just cant seen to figure them out. If someone could explain them that would be great

#### Zeeus

Joined Apr 17, 2019
468

Perhaps can assume L2 is 0 volts and L1 is 120V

In 1st image, circuit 4, after closing switch, the voltage at point C with respect to L2 (L2 is 0v) is 0v....So there is no voltage drop across the bulb

But if there is no voltage drop across the bulb then how will it turn on?

If there is no voltage drop then can assume current is not flowing?

but if the switch is really closed then why should current not flow?

#### ericgibbs

Joined Jan 29, 2010
8,882
hi,
You should check the wiring.
E

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#### jpanhalt

Joined Jan 18, 2008
8,114
First question on circuit #4. Is the circled response your tentative response or what is presumed to be the correct answer.

If it is your answer, then explain how a lamp will light with 0 voltage across its terminals? (Are responses B and c different?) Is there any alternative response that explains the observation?

#### dl324

Joined Mar 30, 2015
9,150
You should check the wiring.
None of the questions posted use circuit #1, but the defects are the whole point of the exercise.

#### dl324

Joined Mar 30, 2015
9,150
Welcome to AAC!
If someone could explain them that would be great
It doesn't work that way. You should explain your reasoning.

Why do you think the answer is a?

Why do you think the answer is b?

What do you think the answer is for this question?

#### WBahn

Joined Mar 31, 2012
24,854
Been sitting on a couple of questions and just cant seen to figure them out. If someone could explain them that would be great
For each question, determine what you believe the measured voltage will be for each circuit and explain your reasoning. Then we can help you understand whether your reasoning is sound or not and how to improve it, if needed.